Stephen Simoni’s breach-of-contract class action lawsuit against United Airlines relied on an email from the airline that said it would “waive the redeposit fee” for his MileagePlus account if he canceled the flight he had just booked with frequent flier miles.But when he canceled, United — pointing to additional terms Simoni could have discovered by clicking on a hyperlink — insisted it was entitled to a $25 redeposit fee because he canceled within 30 days of the flight. He paid the 25 bucks — because the alternative was …